Any soloution to pass through 5.1 sound ?

Hi there im having a problem with surround .while watching movies only getting 2 channle stereo or 5.1 all channel stereo anf vocal coming from all speakers .only propper sound when watching blurays .is there any way to fix it after rooting or flashing etc ?
Also in kodi display is very dark and I cant find any setting to dix this .
Pleae help .
Thanks

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